14 



COMPARATIVE ANATOMY 



Sauropsida. 



Mammalia. 



(b. A MX IOTA (Vertebrates which develop an aimiioii 

 during fetal life). 



1. REPTILIA.. 



a. Crocodilia (Crocodiles and Alligators). 



#. Lacertilia (Lizards, including Hatteria). 



y. Chelonia (Turtles and Tortoises). 



8. Ophidia (Snakes). 



2. AVES. 



a. Ratitce (Cursorial Birds Ostrich, Rhea, Emu, tfcc.).- 

 0. CarinatcK (Birds of flight). 



1. Aplacentalia or Achoria. 



a. Prototheria or Ornithodelphia (Monotremata Orni- 



thorhynchus and Echidna). 

 /3. Metatheria or Didelphia (Marsupialia Kangaroos,, 



Phalangers, Opossums, &c.), 



2. Placentalia or Choriata. 



Eiitheria or Monodelphia. 

 Edentata. 

 Sirenia. 

 Cetacea. 

 Ungulata. 

 Hyracoidea. 

 Proboscidea. 

 Rodentia. 

 Cheiroptera. 

 Insectivora. 

 Carnivora. 

 Lemuroidea 

 Primates. 



